JPH0633532A - Precast concrete slab and manufacture thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a precast concrete plate having the same thickness and capable of withstanding lateral pressure at the time of pouring concrete, and a method for producing the same. [Structure] In a precast concrete board 1, truss bars 4 and spacers 5 are arranged between two concrete boards 2 and 3 having appropriate intervals, and both ends thereof are embedded in the concrete boards 2 and 3, respectively. These are joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete plate in which two concrete plates are connected with a truss bar and a spacer at appropriate intervals, and a method for producing the same.

[0002]

2. Description of the Related Art In general, the wall of a building is constructed by using a precast concrete plate called a half PC plate, which has a truss bar or the like projected on one surface. This is constructed by building a precast concrete plate with the truss liner inside, forming an inner formwork inside it, and pouring concrete between the inner formwork and the precast concrete plate.

However, the above-mentioned construction method still has a problem that it takes a lot of trouble because the inner formwork is still formed to construct the wall. Therefore, in recent years, a precast concrete plate 30 called a so-called double wall in which concrete plates 10 are connected with truss bars 20 at appropriate intervals as shown in FIG. 8 has been devised and used. In this, the concrete board 10 serves as an inner formwork and an outer formwork, respectively, and a wall 40 is constructed by placing concrete 40 between them.

[0004]

However, in the above-mentioned precast concrete plates, since the concrete plates are joined by truss bars, they cannot withstand the lateral pressure when placing concrete between the concrete plates. was there. Further, this precast concrete plate has a problem in that it is not possible to manufacture a precast concrete plate having an interval between the concrete plates, that is, the same thickness, so that the thickness varies. The present invention has been made in view of the above problems, and an object thereof is to provide a precast concrete plate having the same thickness and capable of withstanding a lateral pressure at the time of placing concrete, and a manufacturing method thereof. It is to be.

[0005]

Means for Solving the Problems The gist of a precast concrete plate of the present invention for attaining the above-mentioned object is to provide truss bars and spacers between concrete plates that are opposed to each other with an appropriate interval. The upper end side and the lower end side, and both ends of the spacer are embedded in the concrete plate, and the gist of the manufacturing method is a precast concrete plate having truss bars and spacers protruding from one side of the concrete plate. , The truss bars and the spacers are placed on the lower side, and the truss bars and the spacers are embedded in the concrete, and the end portions of the truss bars and the spacers are embedded in the concrete. It is a rod, and it consists in providing fixing pieces at both ends embedded in the concrete plate.

[0006]

Since the concrete plates with appropriate intervals are connected by the spacers, the spacers can withstand the lateral pressure when placing concrete, and the spacers can keep the intervals between the concrete plates uniform. Since it is possible, a precast concrete plate having the same thickness can be manufactured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a cross-sectional view of a precast concrete plate of the present invention, FIG. 2 is a vertical cross-sectional view of the same, FIG. 3 is a plan view of a precast concrete plate, and FIG. 4 is a perspective view of truss bars,
FIG. 5 is a front view of the spacer.

In the precast concrete plate 1, truss bars 4 and spacers 5 are arranged between two concrete plates 2 and 3 having appropriate intervals, and both ends of these are embedded in the concrete plates 2 and 3, respectively. Has been done. As shown in FIG. 4, the truss line 4 includes one upper end line 4a and two lower end lines 4b arranged at respective vertices of an isosceles triangle.
The corrugated latticed reinforcement 4c is arranged between the upper end reinforcement 4a and the lower end reinforcement 4b to form a triangular prism shape, and the reinforcements are arranged at appropriate intervals along the long sides of the concrete plates 2 and 3.

As shown in FIG. 5A, the spacer 5 is provided with insertion caps 5b made of plastic or mortar on both ends of the connecting rod 5a, and a fixing piece 5c is provided inside the insertion cap 5b. The insertion cap 5b is for facilitating the insertion into the concrete before hardening, and the fixing piece 5c is the concrete plate 2, 3 of the spacer 3.
It firmly fixes inside. (2) of FIG. 5 shows a spacer 5 having an insert fitting 5d attached to one end of the connecting rod 5a. When the spacer 5 is provided, it can be used for attaching the erection support 6 as shown in FIG.

Hereinafter, this precast concrete board 1
The manufacturing method will be described based on (1) and (2) in FIG. 7. First, as shown in (1), reinforcing bars 8 are arranged along the short piece direction of the form 7a, and the truss bars 4 are arranged at appropriate intervals by intersecting the reinforcing bars 8.

Next, spacers 5 are arranged between the truss reinforcements 4 at appropriate intervals, and the upper ends thereof are the upper end reinforcements 4 of the truss reinforcements 4.
After being positioned above a and fixed to the reinforcing bar 8, concrete 2a is poured into the form 7a. When the concrete 2a is demolded after being hardened, the lower end streak 4b of the truss streak 4 and one end of the spacer 5 are fixed to the concrete plate 2
A precast concrete board 1a buried in the is formed.

Next, in the other form 7b, reinforcing bars 8 are arranged in the same manner as described above, and concrete 3a is placed. Then, the precast concrete plate 1a is superposed on the concrete 3a before hardening with the truss reinforcement 4 and the spacer 5 on the lower side, and the upper end reinforcement 4a of the truss reinforcement 4 and the other end of the spacer 5 are inserted into the concrete 3a. ,
The tip is pressed against the bottom surface of the mold 7b.

Therefore, since the precast concrete plate 1a is supported by these spacers 5 and can maintain a predetermined distance from the concrete, the precast concrete plate 1 having the same thickness can be formed. Further, the concrete plates 2 and 3 are firmly connected to each other by the fixing piece 5c of the spacer 5 embedded in the concrete plates 2 and 3.

[0014]

Since the concrete plates can be firmly connected by the spacers, it is possible to manufacture a precast concrete plate that can withstand the lateral pressure when concrete is placed between the concrete plates.

A precast concrete plate having truss bars and spacers protruding from one side of a concrete plate is overlaid on a formwork on which concrete is placed with the truss bars and spacers on the lower side. By embedding the end portion in the concrete, the spacers can hold the intervals of the concrete plates uniformly, so that precast concrete plates having the same thickness can be manufactured.

Since the fixing pieces are provided at both ends of the spacers embedded in the concrete plate in the precast concrete plate, the connection of these concrete plates can be strengthened.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a precast concrete board.

FIG. 2 is a cross-sectional view of a precast concrete board.

FIG. 3 is a plan view of a precast concrete board.

FIG. 4 is a perspective view of a truss muscle.

5 (1) and (2) are front views of a spacer. FIG.

FIG. 6 is a side view of the built-in precast concrete board.

7 (1) and (2) are cross-sectional views of a precast concrete plate showing a manufacturing method.

FIG. 8 is a cross-sectional view of a conventional precast concrete board.

[Explanation of symbols]

 1 Precast concrete board 2, 3 Concrete board 4 Truss bar 5 Spacer

Claims (3)

[Claims] 1. Truss bars and spacers are arranged between concrete plates that are opposed to each other at appropriate intervals, and upper and lower ends of the truss bars and both ends of the spacer are embedded in the concrete plate. Precast concrete board featuring. 2. A precast concrete plate having truss bars and spacers protruding from one side of a concrete plate is overlaid on a formwork on which concrete is placed with the truss bars and spacers on the lower side. A method for manufacturing a precast concrete plate, characterized in that the end portion of the spacer is embedded in the concrete for manufacturing. 3. The precast concrete board according to claim 1 or 2, wherein the spacer is a connecting rod, and fixing pieces are provided at both ends embedded in the concrete board.